/*******************************************************************************
 * Copyright (c) 2011 Luaj.org. All rights reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 ******************************************************************************/
package com.org.luaj.lib.jse;

import com.org.luaj.Varargs;
import com.org.luaj.lib.VarArgFunction;

/**
 * Java method or constructor.
 * <p>
 * Primarily handles argument coercion for parameter lists including scoring of compatibility and
 * java varargs handling.
 * <p>
 * This class is not used directly.
 * It is an abstract base class for {@link JavaConstructor} and {@link JavaMethod}.
 *
 * @see JavaConstructor
 * @see JavaMethod
 * @see CoerceJavaToLua
 * @see CoerceLuaToJava
 */
abstract
class JavaMember extends VarArgFunction {

    static final int METHOD_MODIFIERS_VARARGS = 0x80;

    final CoerceLuaToJava.Coercion[] fixedargs;
    final CoerceLuaToJava.Coercion varargs;

    protected JavaMember(Class[] params, int modifiers) {
        boolean isvarargs = ((modifiers & METHOD_MODIFIERS_VARARGS) != 0);
        fixedargs = new CoerceLuaToJava.Coercion[isvarargs ? params.length - 1 : params.length];
        for (int i = 0; i < fixedargs.length; i++)
            fixedargs[i] = CoerceLuaToJava.getCoercion(params[i]);
        varargs = isvarargs ? CoerceLuaToJava.getCoercion(params[params.length - 1]) : null;
    }

    int score(Varargs args) {
        int n = args.narg();
        int s = n > fixedargs.length ? CoerceLuaToJava.SCORE_WRONG_TYPE * (n - fixedargs.length) : 0;
        for (int j = 0; j < fixedargs.length; j++)
            s += fixedargs[j].score(args.arg(j + 1));
        if (varargs != null)
            for (int k = fixedargs.length; k < n; k++)
                s += varargs.score(args.arg(k + 1));
        return s;
    }

    protected Object[] convertArgs(Varargs args) {
        // 修复此方法不支持可变参数(如：Object process(String cmd, byte[]... args))的问题（20220503）
        Object[] a;
        if (varargs == null) {
            a = new Object[fixedargs.length];
            for (int i = 0; i < a.length; i++)
                a[i] = fixedargs[i].coerce(args.arg(i + 1));
        } else {
            int n = Math.max(fixedargs.length, args.narg());
            a = new Object[fixedargs.length + 1];
            for (int i = 0; i < fixedargs.length; i++) {
                a[i] = fixedargs[i].coerce(args.arg(i + 1));
            }

            // 以下为可变参数部分
            CoerceLuaToJava.ArrayCoercion ac = (CoerceLuaToJava.ArrayCoercion) varargs;
            if (ac.componentType == byte[].class) {
                byte[][] b = new byte[n - fixedargs.length][];
                a[a.length - 1] = b;
                for (int i = fixedargs.length; i < n; i++) {
                    b[i - fixedargs.length] = (byte[]) varargs.coerce(args.arg(i + 1));
                }
            } else if (ac.componentType == String.class) {
                String[] b = new String[n - fixedargs.length];
                a[a.length - 1] = b;
                for (int i = fixedargs.length; i < n; i++) {
                    b[i - fixedargs.length] = (String) varargs.coerce(args.arg(i + 1));
                }
            } else {
                Object[] b = new Object[n - fixedargs.length];
                a[a.length - 1] = b;
                for (int i = fixedargs.length; i < n; i++) {
                    b[i - fixedargs.length] = varargs.coerce(args.arg(i + 1));
                }
            }
        }
        return a;
    }
}
